A standard or smart light switch failing to turn on a light fixture is typically caused by an interrupted power supply from a tripped breaker, a loose wire terminal connection, a blown bulb, or a faulty internal switch mechanism. Turn off power at the main breaker, remove the wall plate, and inspect all wire terminal screws and wire nuts for looseness, corrosion, or disconnected conductors. Ensure that hot, neutral, and load lines are properly seated. Verification: Restore power at the breaker, use a non-contact voltage tester to confirm power reaches the switch terminals, and toggle the paddle to verify that the light illuminates steadily.
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